Forces

What forces are involved with a zipper?

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...losely at the teeth, you'll see that they have some indentations and/or protrusions which fit nicely with the same indentations and/or protrusions on teeth on the opposite half.

These indentations and/or protrusions are such that, when the teeth from both halves are together, they kind of stuck together because the distance between them is exactly what's needed for a teeth from the other half ...